Earlier quoted context omitted.
And make money how? Creators are dependent on platforms to get and monetize attention. People aren't going to stop using Instagram and YouTube because a few superstars only post content on TikTok.
Even moderately successful YouTubers rely on sponsorship and because there's competition for creators between platforms it would take illegal coordination to present a united front and ban it
The fact that you call them "Youtubers", identifying them using the trademark of one particular platform rather than a generic descriptor like "video content creator", suggests that there is not quite as much healthy competition as you claim. Most video companies other than youtube only compete with youtube in a narrow sense; a great deal of the content on youtube does not fit on tiktok's platform, which is only good for short-form content. Netflix only hosts movies or TV shows. Twitch is for livestreaming; other kinds of content don't fit into the paradigm of twitch. Vimeo has never been a good place for off-the-cuff home movies, they too try to compete with youtube only in a narrow domain, not across the board. The few generalist video hosting companies other than youtube are all jokes that are faaar behind youtube in viewer counts.